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自广泛开展计划免疫工作以来,各地传染病发病率大幅度下降,但在少数地区的村屯,个别传染病仍然没有得到控制,偶尔出现局部流行或暴发。其原因是多方面的,但疫(菌)苗质量、免疫个体差异和接种工作中的失误是其中的主要影响因素。首先,任何一种生物制品的免疫效果都不能给机体以100％的保护,如麻疹疫苗初免的抗体阳转率为95％～98％,脊髓灰质炎疫苗三次免疫后免疫率为95％,而接种卡介苗后,可使80％的人不发生结核病。生物制品本身也存在影响免疫效果的问题,疫(菌)苗的效价和纯
Since the extensive immunization program, the incidence of infectious diseases in various places has dropped drastically. However, in a few areas, individual infectious diseases are still under control and the epidemic or outbreak occasionally occurs. The reasons are many, but the quality of vaccine (bacteria), immune individual differences and vaccination mistakes are the main influencing factors. First of all, the immune effect of any biological product can not give the body 100% protection, such as measles vaccine initial immunization rate of 95% to 98%, polio vaccine immunization rate of 95% after three immunizations, After BCG vaccination, can make 80% of people do not have tuberculosis. Biological products themselves also affect the immune effect of the problem, the vaccine (bacteria) vaccine potency and pure